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* Sunny 16 Rule- What it is: Method of estimating correct exposures for daylight without a light meter. The rule: On a sunny day and for a subject in direct sunlight, set aperture to F16 and shutter speed to the reciprocal of the ISO. Example: Aperture at F16, ISO at 100, shutter speed at 1/100. Your shutter speed and aperture can be changed from there as long as the F-stop is altered to compensate (think of how Program, Aperture Priority, or Shutter Priority settings work on a camera). Example: 1/250 at F11 gives an equivalent exposure to 1/125 at F16...Read more